JPS58169487A - Dual-head sewing machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an industrial sewing machine, and more particularly to the structure of a double-headed sewing machine for sewing two threads parallel to each other.

Generally, when sewing trim covers, etc. that cover the cushioning material of car seats, structural members such as the main part and the side parts are cut into a predetermined shape and sewn together using an industrial sewing machine. However, since this sewing involves many two straight stitches that are parallel to each other, a double-head sewing machine with two (1) heads on the table is used.

By the way, in conventional double-head sewing machines, the feed direction of one head is opposite to the feed direction of the other head, so it is not possible to simply attach the heads with the same structure to the table; The structure of the head for the feed direction must be symmetrical to the structure of the head for the normal feed direction. For this reason, the structure of the reverse feed head is a special type, and since it is not normally used and there is little demand, the structure of the double-head sewing machine is complicated and expensive.

The object of the present invention is to take the above-mentioned conventional situation into consideration, and by arranging two heads of normal structure on a table and driving one of the heads in the opposite direction with respect to the other head, the two heads are parallel to each other. To provide an inexpensive double-headed sewing machine with a simplified structure capable of sewing two rows.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a double-headed sewing machine according to the present invention will be described in detail with reference to the drawings.

FIG. 1 is a partially cutaway perspective view of a double-headed sewing machine according to the present invention, and the double-headed sewing machine has a table IA installed horizontally at approximately the same height from the installation floor.

(2) Heads 2A and 2B of normal structure are mounted on 1]3. The tables IA and IB are connected by a connection table 3 with their heads 2A and 2B facing oppositely to each other, and one table IB is fixed to the connection table 3 and the other table IA is fixed to the connection table 3. can move freely in a certain direction (c-y
ing.

1) Needle bar 4A5 is attached to each head 2A and 211 marked in 1.
413 and presser feet 5A, 511 are attached to each table IA and IB.
It is installed in an upright position, protruding towards the front. The sub-rods 4A, 4B are moved downward by the drive of the motor 10, and the presser bars 5A, 5B are moved up and down by an operation lever (not shown).These sub-rods 4A
and a table IA located below the presser foot 5A, the needle bar 4B, and the presser foot 5B, respectively.

IB is equipped with feed south 6A, 6B, each feed dog 6A.

The ring 6B is driven by a motor 10, which will be described later, to close the ring in the vertical direction in the shape of an opening, and to swing back and forth while drawing a locus of motion in a constant direction. - Also, needles 7A and 7B are detachably attached to the needle bars 4A and 4B, respectively, and the needles 7A and 7B are detachably attached to the needle bars 4A and 4B, respectively.
The needle hole in 7B is not shown (3) Rotatably fit into the omitted bobbin shaft / From the bobbin winder -L
The thread is threaded. A hook (not shown) is attached to the lower part of each of the feed dogs 6A, 6B, and the bobbin thread is supplied from a bobbin that is removably inserted into each hook.

- On the other hand, a reversing lever 8A attached to the head 2A, &
:J: Normally, the reversing lever 8B mounted on the head 2B is set at the 15-stroke reverse rotation position. The restoration of the reversing lever 8B is regulated by a bee regulating portion 9 which is removably attached to the head 213. piJ
Due to the rotation of the reversing lever 8B, the feeding direction of the feed dog 6B is the same as the feeding direction of the feed dog 6A, that is, arrow A.
direction. Therefore, the presser foot 5A and the feeder 6A, as well as the presser foot 5B and the feed dog 6B, are connected to the elastic presser foot and the feed dog by driving the motor 10, which will be described later. While being intermittently transferred in the direction of the arrow A in cooperation with the feed drive of the hooks 6A and 6B, two threads are sewn parallel to each other using the upper threads from the hooks 6A and 6B and the lower threads from the bobbin.

(4) On the other hand, as shown in FIG. 2, the table IA is placed in a fixed state on the installation floor LIc, and the table IB is movable to the installation floor. Said Delpul 1A
A motor 10, a reduction gear 11, and a transmission mechanism 2 are respectively attached in an interlocked manner between the legs 107 of the table 1, and the output shafts 1 and 3 of the transmission 12 extend across the tables IA and IB. Goo IJ1 of the same diameter attached to both ends of this output shaft 13
4A.

14I3 and the heads 2A and 2B while each other ([Flypoil bouli 15A of the same diameter rotated in opposite directions,
1511, endless belts 16A, 16B are passed around the belts 1511, and when the motor 10 is driven, the auxiliary rods 4A, 4B and the feed dogs 6A, 6B are moved to the above-mentioned predetermined position via the reducer 11 and the converter 12. is driven by the motion of

Said boo! Four spline parts 15 are carved in the axial direction of the output shaft 13 on the circumferential surface of the output shaft 13 on which J14B is arranged,
A spline convex portion that is associated with the four spline portions 15 is projected from the hole wall surface of a through hole (not shown) bored in the boss of the pulley 14. Due to the fit of the spline convex parts, the above-mentioned Boo!
714B is mounted so as to be movable in the axial direction of the output shaft 13. The pulley 14B is located between four lug arms 16 fixed to the table lH.

- The bolt and nut mechanism 17 is still installed between the table IA and the table 18, and the screw shaft 18 of the bolt and NAND mechanism 17 is connected to the table IB with respect to the table IA.
The output shaft 13 extends parallel to the output shaft 13 in the direction of movement, that is, in the direction of arrow B. The base end of this screw shaft 18 is rotatably attached to the leg 10' of the table IA, and the extended end of the screw shaft 18 is attached to the bolt fixed to the leg 19 of the table IB, and the nut 20 of the NAND mechanism 17. It's barely fit. A handle 21 is fixed to the end of the screw shaft 18 protruding from this neck 1-20, and by rotating the handle 21 in the forward direction, the table IB is attached to the leg body 19. At this point, the two heads and head 2B are moved forward in the direction of arrow B, and the two heads and head 2B are moved between the eyebrows. Then, by reversing the handle 21, the table IB is moved back in the direction opposite to the direction of the arrow B, that is, in the direction of the arrow C, and (6) the two heads and the head 2B are brought closer together. The head 2A.

The distance between the two stitches applied to the sewing member by the approaching and separating operations of the needles 2B, that is, the distance 1 between the needles 6A and 6B shown in the second figure is set to an appropriate distance.

The transmission 12 has a continuously variable transmission structure, and the operation lever 23 of the transmission 12 extends from the transmission 12 toward the front side of the table IA, as shown in FIG. The operating end 23 also projects in the front direction from the leg 1o'' on the front side of the table IA.

Furthermore, as shown in FIG. 1, the feed dog 6A.

There are openings 24A, 24 in the connecting table 3 where 6B is located.
B is bored, and each feed tooth 6A is formed by each opening 24A, 24B.

6B protrudes slightly beyond the top surface of the connecting tape 7+/30 when the feeding mechanism is driven, and is retracted slightly below the top surface of the connecting table 3 during backward movement in the direction opposite to the feeding mechanism.

The opening 24B is wide in the direction of movement of the table IB, so that the feed dog 6B moves within the opening 24B as the table IB moves.

(7) A pair of guide holes 25A are provided in the connecting table 3 located before and after the feed teeth 6A and 6B in the feed drive direction, respectively.
25B is carved in a long and narrow direction in the moving direction of the table IB, and each pair of guide holes 25^25B has a feed tooth 6A,
Guide plates 26A, 26 extending along the outside of 6B
B is located. Each guide plate 26A, 26B is penetrated by a port 27 that is slidably fitted into the guide hole 25A, 25B, and the guide plate 26A of these port 27 is inserted into the guide hole 25A, 25B.
, 26B, a nut 28 is attached to the protruding top. By tightening this nut 28, the guide plates 26A and 26B are fixed in position on the top surface of the connecting table 3, and by loosening the nut 28, the guide plates 26A and 26B are fixed.

26B becomes movable in the longitudinal direction of the guide holes 25A and 25B.

In the embodiment configured as described above, when sewing two rows, first, table IB is moved relative to table IA in the direction of arrow B or arrow C by the port and nut mechanism 17, and the width l of double row stitching is set by a predetermined distance. Set to . (8) When this table IB is moved, the pulley 14B is moved by the shaped arm 16 in synchronization with the movement of the flywheel pulley 15B, so the pulley 14B and the flywheel pulley 15B
The linked state is always maintained normally.

Then, the speed change lever 23 is used to set the feed speed of the feed teeth 6A, 6B to a speed suitable for the sewing member, and the position of the double stitch with respect to the sewing member is set by moving and fixing the position of the guide plates 26A, 26B. Next, after preparing for this sewing, the sewing members are placed on the guide plate 2.
6A and 26B, the sewing start end of the sewing member is inserted between the pressers 5A and 5B and the feed dogs 6A and 5B, and the motor 10 is driven. By driving the motor 10, the sewing member is intermittently moved in the direction of the arrow by the elastic presser feet 5A and 5B and the feed drive of the feed dogs 6A and 6B, and the upper and lower threads are moved intermittently in the direction of the arrow. A predetermined interval l depending on the thread
Two rows are sewn parallel to each other.

By the way, according to the embodiment, the head 2A of normal structure,
Since it has a simplified structure in which the 2Bs face each other in opposite directions, it is possible to provide a double-head sewing machine that is cheaper than the conventional double-head sewing machine (9). Moreover, since the reverse rotation drive speed of the feed dog 6B is the same as the forward rotation drive speed, the feed dog 6A, 6B can be Since the feeding speeds in the direction of arrow A are synchronized, inconveniences such as a phenomenon of one-sided tilting of the sewing member can also be prevented.

In addition, in the said Example, although the case where it was driven by - number of motors 10 was illustrated, this invention is not limited to this, and the head 2A.

It is also possible to provide a motor for each 2B and incorporate a synchronization mechanism on the head side of one of the motors. In addition, the reverse rotation of the boots IJ 15A and 15B in the above embodiment is as follows.
16B, or by dividing the output shaft 13 of the transmission 12 into the heads 2A and 2B and rotating the divided output shafts in opposite directions.

As explained above, according to the present invention, by facing the same heads of normal structure in opposite directions,
Simplification compared to conventional double-head sewing machines 10) In addition to being able to provide a double-head sewing machine at a low cost, it is possible to prevent the phenomenon of one-sided tilting of the seam H by simply making the forward and reverse drives the same in both heads. , efficient double-row stitching can be performed.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view of a double-head sewing machine according to the present invention, FIG. 2 is a front view of the double-head sewing machine, and FIG. 3 is a right side view of the double-head sewing machine. IA, IB...Table, 2A, 2B...Head, 3
...Connection table, 5A,,5T3...Presser foot, 6A
, 6B... Feed dog, 8A, 8B... Reverse lever, 1
0...Motor, 11...Reducer, 12...Transmission. (11)

Claims (1)

[Claims] Two sewing machine heads of normal structure are provided, each having a presser foot and a feed dog for sandwiching the sewing member, and these heads are arranged in substantially the same horizontal manner with opposite directions, and one of the heads is A double-headed sewing machine characterized in that the feed teeth of the other head are driven in reverse in synchronization with the feed drive of the feed teeth of the other head.